For sure, they have the upper hand because, if you win, you may decide to bet it all on the next week/game. They can afford to keep getting against you until you are either broke or go home. This is true in all forms of casino gambling, not just sports gambling.

In sports betting, there are two formats, both designed to give the house the edge. The first is THE SPREAD. Have you ever noticed that the spread changes over time? This is because the number of people betting one way or the other changes, and the bookies slide the spread one way or the other to encourage the bets... one way or the other.

If you place a bet with a spread, your bet reamains the same, but future best will have a different spread. Let’s say, for example, you bet $X that “Team A” will win and they are favored to win by 2, which makes the spread -2 against you.

If the majority of people start betting on the same team as you, the spread may increase and those new betters will see -3, -4 or more, making it harder for folks to win, of course.

On the contrary, if many begin to bet for the underdog, you will see the spread decrease or even switch over.

The entire system is designed to ensure that more betters end up on the losing side, than on the winning side.

If successful, any betters that win are actually just sharing the money with the house that was lost by the majority of the losing bets. This doesn't always work, but as long as it usually works, the house makes a bundle.

The other system is ODDS BETTING, which is pretty self-explanatory as to how the house ends up on top.